Nick and Joe Jonas Double Date with Priyanka & Sophie ... And 5th Wheel, Kevin

7/16/2018 6:01 PM PDT

Nick and Joe Jonas Double Date with Older Bro Kevin as Fifth Wheel

The Jonas Brothers reunited this week with their ladies hanging off their arms -- well, everyone except Kevin ... the only one who's actually married. 

Nick and Joe Jonas were spotted hitting up the 34 Mayfair restaurant in London Monday, with Priyanka Chopra and Sophie Turner tagging along for the double date. 

Everyone was looking suave as hell, including their older Jonas broski, Kev, who ironically showed up solo as a fifth wheel. He's actually married -- has been since 2009 -- and already has a couple kids with his wife, Danielle. No sign of them here, though.

Maybe Kevin just wanted to impart some long-term relationship wisdom on his little bros by himself ... or maybe he owes Danielle a huge favor for babysitting.